Exactly.Similarly, I just need to make a predator think long enough that the next target will be easier.
In this example, the criminal has completed phase 1 (Target selection) and 2 (Target approach), and is in the process of phase 3 (Final target assessment) where the film begins. Examine the non-verbal communication between the two, in particular the posture and distance, and you can see why the target was selected, and why the threats' intentions should have been perfectly clear long before he launches his attack.
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Lets look at it from the criminals point of view first:
1. Target selection - Target seems smaller physically and could be overpowered or intimidated. Target has possessions that may be of worth. Target is alone, and in location conducive to an attack. [attack conditions met = yes]
2. Target approach - Target is non-responsive to the approach. Target is displaying passive body language and does not look like it will resist. Target appears to be intimidated and is keeping its head down and won't look at me, possibly out of fear. [attack conditions met = yes]
3. Final target assessment - Target remains completely passive. Target does NOT defend personal space, and probably won't resist much. [attack conditions met = yes]
4. Assume attack position - Make final position adjustment, attempt to distract, and attack. [attack conditions met = yes]
5. Launch attack - SUCCESS! I'M THE MAN!!!.....WHOA....wait a min....what the....holy! Oh no, I think I'm getting chok..ZZZZZzzzzzzzzzzzzzz............. [attack = FAIL]
Now lets examine it from the citizen perspective:
1. Target selection - Why is this dude eyeing me up and down, and why is he alone and hanging out in a subway? The dude looks like a thug. (Course of action: project confidence and strength in body language. LOOK at the potential threat and gauge their reaction to YOUR look. If they have the "crap, they see me..." expression on their face, something is up.
2. Target approach - Why is this dude closing the distance toward me? I better keep this dude at arms length. (Course of action: Observe the approach, identify avenues of possible retreat, prepare for defense in place, assume non-threatening defensive posture, extend arm and tell the dude to hold outside of personal space)
3. Final target selection - Why is this dude trying to "square up" to me / breach my personal space / not complying with my request to leave? (Course of action: Maintain distance and defensive posture conveying you consider them a threat and WILL defend your personal space, TELL them to beat feet, non-compliance combined with intentional breach of personal space means hostile intent and the immediate need to defend yourself accordingly, which may or may not include the use of force.
Bottom line: Even if the target DID project strength, he would more than likely have been approached, HOWEVER, had he recognized the non-verbal communication displayed by the threat and acted on it, he could have challenged the threat at arms length, which would have required the attacker to reveal his intent to attack. That challenge may have been enough to convince the attacker it wasn't worth the trouble.